An
analysis of compatibility of the generalized Rydberg equation of state with the
reciprocal K-primed equation of state has been presented. The method is based
on the formulation for higher pressure derivatives of bulk modulus and the
third-order Grüneisen parameter in the limit of extreme compression. It is
found that the generalized Rydberg equation becomes consistent with the
reciprocal K-primed EOS when a quadratic term in P/K is included
in the expression. This finding is consistent with the recent studies on the
generalized Rydberg equation.

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